Question

我添加了一个表，但问题是，面板没有显示其背景颜色。我试过设置滚动窗格背景颜色等。但它不起作用。框架上有一个“验证”按钮，单击该按钮可在其下方显示一个表格。在单击之前，表格将显示的部分为灰色。我希望整个部分是象牙背景。请帮我诊断问题。

try
{
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    Connection conn1=DriverManager.getConnection("jdbc:odbc:vasantham","","");
    Statement st1=conn1.createStatement();
    ResultSet rs1=st1.executeQuery("select * from try where DATEDIFF('d',NOW(),exdate) &lt; 61 order by tname");
    ResultSetMetaData md1=rs1.getMetaData();
    int cols1=md1.getColumnCount();
    model1=new DefaultTableModel();
    model1.addColumn("Purpose");
    model1.addColumn("Name");
    model1.addColumn("Composition");
    model1.addColumn("Expiry");
    model1.addColumn("Stock");
    model1.addColumn("Cost");
    model1.addColumn("Type");
    model1.addColumn("Supplier");
    model1.addColumn("Supplier Number");
    model1.addColumn("Rack");
    table1=new JTable(model1);
    Color ivory=new Color(255,255,208);
    table1.setOpaque(false);
    table1.setBackground(ivory);
    String[] tabledata1=new String[cols1];
    int i=0;
    while(rs1.next())
    {
        for(i=0;i&lt;cols1;i++)
        {
            if(i==3)
            {
                Date intr1=(rs1.getDate(i+1));
                tabledata1[i]=formatter1.format(intr1);
            }
            else
            tabledata1[i]=rs1.getObject(i+1).toString();
        }
        model1.addRow(tabledata1);
    }
    JScrollPane scroll1 = new JScrollPane(table1);
    scroll1.setBackground(new Color(255,255,208));
    scroll1.getViewport().setBackground(ivory);
    panel1.setLayout(new BorderLayout());
    panel1.setBackground(ivory);
    table1.getTableHeader().setBackground(ivory);
    panel1.add(scroll1,BorderLayout.CENTER);
    frame1.add(panel1,BorderLayout.CENTER);
    conn1.close();
}

Output

Answer 1

滚动窗格包含另一个组件，称为ViewPort。这实际上是添加了分配给滚动窗格的组件的位置。

如果要将JTable维持为透明（table1.setOpaque(false);），则需要更改视口背景

scroll1.getViewport().setBackground(ivory);

否则，将表设置为opaque，table1.setFillsViewportHeight(true);强制表填充整个视口

<强>已更新

适合我的工作

model1 = new DefaultTableModel();
model1.addColumn("Purpose");
model1.addColumn("Name");
model1.addColumn("Composition");
model1.addColumn("Expiry");
model1.addColumn("Stock");
model1.addColumn("Cost");
model1.addColumn("Type");
model1.addColumn("Supplier");
model1.addColumn("Supplier Number");
model1.addColumn("Rack");

for (int index = 0; index < 10; index++) {

    Vector vector = new Vector();
    vector.add("p" + index);
    vector.add("n" + index);
    vector.add("c" + index);
    vector.add("e" + index);
    vector.add("s" + index);
    vector.add("c" + index);
    vector.add("t" + index);
    vector.add("s" + index);
    vector.add("s" + index);
    vector.add("r" + index);

    model1.addRow(vector);

}

table1 = new JTable(model1);
Color ivory = new Color(255, 255, 208);
table1.setOpaque(true);
table1.setFillsViewportHeight(true);
table1.setBackground(ivory);

JScrollPane scroll1 = new JScrollPane(table1);
table1.getTableHeader().setBackground(ivory);
add(scroll1, BorderLayout.CENTER);

你可以注释掉行创建部分，它仍然会以象牙形式绘制。

Answer 2

为什么你的意思不起作用？

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableCellClass {

    private JFrame frame = new JFrame("Table Demo");
    private String[] columnNames = {"String", "Integer", "Float", "Double", "Locale & Double", "Boolean"};
    private Object[][] data = {
        {"aaa", new Integer(12), new Float(12.15), new Double(100.05), new Double(12.05), true},
        {"bbb", new Integer(5), new Float(7.154), new Double(6.1555), new Double(417.55), false},
        {"CCC", new Integer(92), new Float(0.1135), new Double(3.1455), new Double(11.05), true},
        {"ddd", new Integer(12), new Float(31.15), new Double(10.05), new Double(23.05), true},
        {"eee", new Integer(5), new Float(5.154), new Double(16.1555), new Double(17.55), false},
        {"fff", new Integer(92), new Float(4.1135), new Double(31.1455), new Double(3.05), true}};
    private TableModel model = new DefaultTableModel(data, columnNames) {

        private static final long serialVersionUID = 1L;

        @Override
        public Class<?> getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };
    private JTable table = new JTable(model);

    public TableCellClass() {
        table.setRowHeight(20);
        //table.setPreferredScrollableViewportSize(table.getPreferredSize());
        table.setBackground(Color.red);
        JScrollPane scroll = new JScrollPane(table);
        scroll.getViewport().setBackground(Color.blue);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scroll);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                TableCellClass tableCellClass = new TableCellClass();
            }
        });
    }
}

这可能会更好，如果你想玩不透明度???

import java.awt.*;
import javax.swing.*;

public class TableWithTimer  {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();
    private JScrollPane scroll = new JScrollPane();
    private JTable myTable;
    private String[] head = {"One", "Two", "Three", "Four", "Five", "Six"};
    private String[][] data = new String[25][6];

    public TableWithTimer() {
        myTable = new TableBackroundPaint0(data, head);
        myTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        myTable.setGridColor(Color.gray);
        myTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        scroll.setViewportView(myTable);
        frame.add(scroll, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(100, 100);
        frame.pack();
        frame.setVisible(true);
    }


    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                TableWithTimer tableWithTimer = new TableWithTimer();
            }
        });
    }
}

class TableBackroundPaint0 extends JTable {

    private static final long serialVersionUID = 1L;

    TableBackroundPaint0(Object[][] data, Object[] head) {
        super(data, head);
        setOpaque(false);
        ((JComponent) getDefaultRenderer(Object.class)).setOpaque(false);
    }

    @Override
    public void paintComponent(Graphics g) {
        Color background = new Color(168, 210, 241);
        Color controlColor = new Color(230, 240, 230);
        int width = getWidth();
        int height = getHeight();
        Graphics2D g2 = (Graphics2D) g;
        Paint oldPaint = g2.getPaint();
        g2.setPaint(new GradientPaint(0, 0, background, width, 0, controlColor));
        g2.fillRect(0, 0, width, height);
        g2.setPaint(oldPaint);
        for (int row : getSelectedRows()) {
            Rectangle start = getCellRect(row, 0, true);
            Rectangle end = getCellRect(row, getColumnCount() - 1, true);
            g2.setPaint(new GradientPaint(start.x, 0, controlColor, (int) ((end.x + end.width - start.x) * 1.25), 0, Color.orange));
            g2.fillRect(start.x, start.y, end.x + end.width - start.x, start.height);
        }
        super.paintComponent(g);
    }
}

更改JTable的背景颜色

2 个答案: